The Facebook iOS app, which was built using HTML5 to more easily support development across multiple mobile platforms, has historically been considered a poor effort. A frequent complaint: it's too slow. So Facebook set out to change that, and recently released a new version of its iOS app — the first to use native code instead of HTML5. Initial reports are praising the new app, with some reviewers claiming performance has doubled. For other companies looking to create great mobile apps, here are five things companies can learn from Facebook's mobile experiences. more